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It is a heme-containing enzyme that produces O2 from H2O2 It reduces H2O2 and organic hydroperoxides using GSH and requires selenium It converts superoxide into hydrogen peroxide without cofactors It oxidizes GSSG to GSH using NAD+ Correct Answer: It reduces H2O2 and organic hydroperoxides using GSH and requires selenium Q5

Moustafa F, Feldman SR (2014) A review of phosphodiesterase-inhibition and the potential role for phosphodiesterase 4-inhibitors in clinical dermatology

Reading the gaps in reverse points to what a stronger evidence base would require

Side effects are typically mild, such as temporary soreness or swelling at the injection site

However, as we age or face environmental stressors, our natural levels of glutathione can decrease, leading many to consider supplementation